From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9D727179211; Sun, 24 Mar 2024 23:39:48 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711323589; cv=none; b=o/H1inyjIEc8D9yFeuBRpGKLdZZ2xfwh2HkGd1ageOhn6omcnKeTZEz/swFWEnY2KwDFkryxuHPpba90sqNsNeCypQUECxmb9G/Io9I/vlLfIo5xqfspPgTxFjzDqhtEdsCCcxJAVY+OoVsuMGnejVAHHxbVJ8lRWwtbHep7fvM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711323589; c=relaxed/simple; bh=DP7eS2BLiLJag7ca28yuThlRVBYGxPMMTfFtKxToGc8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=YYB5dW9s5irYQ2r2sZ5gmdN1DFWsqOI79rbZMl/wau9z6Ta+2bLtEe+qs8XoXLqSYEP5lp6jSZ0P+LEQVptPO5H2+7EX7TA3/onKEKIHR8OAAEcvKu6wa/MCHdkBtO9RNM2uy1yB/1X5PO7PY7e6f5Fr2E2a0wbS41r5pBZrG0Q= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=E2DK6M58; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="E2DK6M58" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C7613C433C7; Sun, 24 Mar 2024 23:39:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1711323588; bh=DP7eS2BLiLJag7ca28yuThlRVBYGxPMMTfFtKxToGc8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=E2DK6M589cXo7OBeITRgpNJ7iQ0wG8lSfgIHC8J15ELpf1puuenVuBkrxsPoMBq7z 91gG47c4wpI8DNKr3SykRdMQFbCVEBT1xIlW+ZEbHTOrnglxo20HxfG+U5GBkYs4S4 dj5RaxqLLQy8FTx/BeXzBB9z4emlCmd8lnM6bXkThsnWNqd4GeKB6Zovn41FXgUz3O lvhsW5m4GfC80eY2gLuvLGcami0ViRVNw67yGVTnVG4oa5k0+n+1WVij8ypwvoqO0p gwodVs+X66e+0TYSH23qAS/U6Glu+gWKimrhR9xBknkTQMB18/cKObwvcMWZqwh6Ma RvHYTB+VUc9rA== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Daniel Golle , Bc-bocun Chen , "David S . Miller" , Sasha Levin Subject: [PATCH 5.15 295/317] net: ethernet: mtk_eth_soc: fix PPE hanging issue Date: Sun, 24 Mar 2024 19:34:35 -0400 Message-ID: <20240324233458.1352854-296-sashal@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240324233458.1352854-1-sashal@kernel.org> References: <20240324233458.1352854-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit From: Daniel Golle [ Upstream commit ea80e3ed09ab2c2b75724faf5484721753e92c31 ] A patch to resolve an issue was found in MediaTek's GPL-licensed SDK: In the mtk_ppe_stop() function, the PPE scan mode is not disabled before disabling the PPE. This can potentially lead to a hang during the process of disabling the PPE. Without this patch, the PPE may experience a hang during the reboot test. Link: https://git01.mediatek.com/plugins/gitiles/openwrt/feeds/mtk-openwrt-feeds/+/b40da332dfe763932a82f9f62a4709457a15dd6c Fixes: ba37b7caf1ed ("net: ethernet: mtk_eth_soc: add support for initializing the PPE") Suggested-by: Bc-bocun Chen Signed-off-by: Daniel Golle Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/net/ethernet/mediatek/mtk_ppe.c | 18 +++++++++++------- 1 file changed, 11 insertions(+), 7 deletions(-) diff --git a/drivers/net/ethernet/mediatek/mtk_ppe.c b/drivers/net/ethernet/mediatek/mtk_ppe.c index 66298e2235c91..5e7b66846791d 100644 --- a/drivers/net/ethernet/mediatek/mtk_ppe.c +++ b/drivers/net/ethernet/mediatek/mtk_ppe.c @@ -425,7 +425,7 @@ int mtk_ppe_start(struct mtk_ppe *ppe) MTK_PPE_KEEPALIVE_DISABLE) | FIELD_PREP(MTK_PPE_TB_CFG_HASH_MODE, 1) | FIELD_PREP(MTK_PPE_TB_CFG_SCAN_MODE, - MTK_PPE_SCAN_MODE_KEEPALIVE_AGE) | + MTK_PPE_SCAN_MODE_CHECK_AGE) | FIELD_PREP(MTK_PPE_TB_CFG_ENTRY_NUM, MTK_PPE_ENTRIES_SHIFT); ppe_w32(ppe, MTK_PPE_TB_CFG, val); @@ -493,17 +493,21 @@ int mtk_ppe_stop(struct mtk_ppe *ppe) mtk_ppe_cache_enable(ppe, false); - /* disable offload engine */ - ppe_clear(ppe, MTK_PPE_GLO_CFG, MTK_PPE_GLO_CFG_EN); - ppe_w32(ppe, MTK_PPE_FLOW_CFG, 0); - /* disable aging */ val = MTK_PPE_TB_CFG_AGE_NON_L4 | MTK_PPE_TB_CFG_AGE_UNBIND | MTK_PPE_TB_CFG_AGE_TCP | MTK_PPE_TB_CFG_AGE_UDP | - MTK_PPE_TB_CFG_AGE_TCP_FIN; + MTK_PPE_TB_CFG_AGE_TCP_FIN | + MTK_PPE_TB_CFG_SCAN_MODE; ppe_clear(ppe, MTK_PPE_TB_CFG, val); - return mtk_ppe_wait_busy(ppe); + if (mtk_ppe_wait_busy(ppe)) + return -ETIMEDOUT; + + /* disable offload engine */ + ppe_clear(ppe, MTK_PPE_GLO_CFG, MTK_PPE_GLO_CFG_EN); + ppe_w32(ppe, MTK_PPE_FLOW_CFG, 0); + + return 0; } -- 2.43.0